Matsya Purana — Omens in Tripura and the Nārada–Maya Dialogue on Dharma
दृश्यन्ते भयदाः स्वप्ना भज्यन्ते च ध्वजाः परम् विना च वायुना केतुः पतते च तथा भुवि //
dṛśyante bhayadāḥ svapnā bhajyante ca dhvajāḥ param vinā ca vāyunā ketuḥ patate ca tathā bhuvi //
Frightening dreams are seen; banners and standards are utterly broken; and even without any wind, a ketu (comet/meteor) falls down upon the earth—these are supreme portents of fear.
It does not describe cosmic Pralaya directly; it lists calamity-portents (nimittas) that traditionally foreshadow upheaval—war, disaster, or widespread distress—within the human realm.
For a king, such signs demand heightened vigilance: consult learned advisers, perform pacificatory rites (śānti), strengthen protection of subjects, and correct policy failures; for householders, it signals caution, prayer/ritual appeasement, and avoidance of risky ventures.
Ritually, these are inauspicious nimittas calling for śānti-karmas (appeasement rites). Architecturally, the breaking of dhvajas (standards) functions as a public-temple/royal-site omen—prompting re-consecration, inspection, and remedial rites to restore auspiciousness.